LC78681E 查看數據表（PDF） - SANYO -> Panasonic

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LC78681E

Digital Signal Processor for Compact Disc Players

SANYO -> Panasonic 

2. 2-byte Commands

LC78681E

The commands are executed on the falling edge of RWC.

Focus Servocontroller (pin 13: FOCS, pin 14: FST, pin 15: FZD and pin 57: LASER)

MSB

LSB

00001000

10100010

00001010

10001010

00000000

Command

FOCUS START #1

FOCUS START #2

LASER ON

LASER OFF

NOTHING

1. Laser Control

RES = low

2. Focus Start

When a Focus Start command (either 1 or 2) is issued, the pickup lens is first lowered as C1 discharges through FST

and then raised gradually as C1 is recharged by FOCS. FZD goes low when the focal point is reached, and FOCS is

reset and the focus servocontroller turned on when this signal is received.

After issuing this command, the microprocessor checks the DRF signal from the LA9210 to verify that focus has

been reached, and advances to the next step. If C1 recharges fully before focus has been reached, the Focus Start

command should be reissued to repeat operation of the focus servocontroller.

No. 4521-9/23

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